BMW X6 50i Engine ReplacementCompare Prices & Get Quotes
Get quotes today from trusted UK BMW X6 50i engine specialists. Compare prices on reconditioned, rebuilt and used N63 V8 engines - supply & fit available nationwide.
Supply & Fit Available
12-Month Warranty
Nationwide Delivery
100+ Suppliers
From £3,500 to £7,500
Used from £2,500 · Reconditioned from £3,500 · Common codes: N63B44A, N63B44B, N63B44O0
From £2,500
Tested, bare/short engine
From £3,500
Rod bearings addressed, tested
From quote
Upgraded bearings, full teardown, revised valvetrain
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3 Simple Steps3 Simple Stepsto Finding the Best BMW X6 50i Replacement Engineto Finding the Best BMW X6 50i Replacement Engine
Most replacements completed within 3-5 days.
Variant HistoryBMW X6 50i - Engine History & Specs at a Glance
The BMW X6 50i launched with the E71 generation in 2008, introducing BMW's first "hot-vee" twin-turbocharged V8 petrol engine to the Sports Activity Coupé range. The N63B44A delivered 408hp and 600Nm of torque through a six-speed automatic transmission and xDrive all-wheel drive. In 2012, the X6 50i received the updated N63B44B engine with 445hp as part of the F16 generation, featuring improved injectors, valve seals and cooling system components.
Variant HistoryBMW X6 50i - Engine History & Specs at a Glance
The BMW X6 50i launched with the E71 generation in 2008, introducing BMW's first "hot-vee" twin-turbocharged V8 petrol engine to the Sports Activity Coupé range. The N63B44A delivered 408hp and 600Nm of torque through a six-speed automatic transmission and xDrive all-wheel drive. In 2012, the X6 50i received the updated N63B44B engine with 445hp as part of the F16 generation, featuring improved injectors, valve seals and cooling system components.
BMW X6 50i
Fuel TypePetrol
Engine Size Range4.4L (4395cc)
Power Output Range408-450hp across the variant's historyEngine History Timeline
N63B44A introduced with E71 X6 50i 4.4L twin-turbo V8, 408hp (300kW), 600Nm torque, 6-speed automatic
ActiveHybrid variant launched with N63B44A plus electric motor 485hp combined
N63B44B (Technical Update) introduced with improved valve stem seals and injectors
F16 generation launches; N63B44B continues with 445hp and 8-speed automatic transmission
F16 production ends; G06 generation replaces 50i with M50i (N63B44C 530hp)
Key Specs Snapshot
Fuel TypePetrolEngine Size Range4.4L (4395cc)Power Output Range408-450hp across the variant's historyYears Produced2008-2019Every engine fitted to the BMW X6 50i is covered below, with UK rebuilt pricing and known failure points - from the E71 launch to the final F16 examples.
BMW X6 50i Engine Codes - Specifications & Replacement CostBMW X6 50i Engine Codes - Specifications & Replacement Cost
4.4L Twin-Turbo V8 Petrol (2008-2012)
Power Output408hp (300kW)Torque600NmYears Fitted2008-2012
Compatible Trim Levels
- xDrive50i (E71)
- xDrive50i M Sport (E71)
- ActiveHybrid (E72)
Find your exact engine code, specs and UK replacement cost guide.
Used
Tested, ready-to-fit engine
£2,500-£4,500
Reconditioned
Addressed known issues, tested
£4,500-£6,500
Rebuilt
Full teardown, upgraded internals
£5,500-£7,500
Common Failure
Valve stem seal failure causing excessive oil consumption - some early N63 engines consume 1 litre every 600 miles. Timing chain guides made of brittle plastic break apart under heat cycling. High-pressure fuel pump failure can cause long cranking, misfires and reduced power.
The BMW X6 50i is powered by the N63 4.4-litre twin-turbocharged V8 petrol engine - BMW's first "hot-vee" engine with turbochargers mounted inside the V of the engine. While the N63 delivers exceptional power and a distinctive V8 soundtrack, it has a well-documented reputation for heat-related reliability issues. Below we break down the most common N63 failures on the X6 50i, what you'll pay at a dealer versus a specialist, and when replacement is the only sensible answer. Every rebuilt N63 engine supplied through EnginesMarket includes upgraded components designed to address the original failure point - plus a minimum 12-month unlimited mileage warranty.
Why the BMW X6 50i N63 Engine Smokes on Start-Up
Affected Vehicles
BMW X6 50i (N63B44A, N63B44B, 2008-2019)
Typical Failure Mileage
50,000-90,000 miles
Root Cause
The hot-vee design cooks valve stem seals, causing them to harden and leak oil into the combustion chamber. Some early N63 engines consume 1 litre every 600 miles. Symptoms include blue/white smoke from the exhaust on cold start or after a hot soak, excessive oil consumption, and fouled spark plugs.
Why It Happens
The hot-vee design cooks valve stem seals, causing them to harden and leak oil into the combustion chamber. Some early N63 engines consume 1 litre every 600 miles. Symptoms include blue/white smoke from the exhaust on cold start or after a hot soak, excessive oil consumption, and fouled spark plugs.
Dealer (parts + labour)
£3,500-£5,000
Specialist (parts + labour)
£2,200-£3,500
What it involves
Replace all 32 valve stem seals using specialist tooling; engine remains in vehicle
Suitability
Viable if smoke occurs but no other damage; requires specialist tooling
1 - 2 daysDealer (parts + labour)
£8,000-£12,000
Specialist (parts + labour)
£5,500-£8,500
What it involves
Supply & fit rebuilt N63 with upgraded valve seals and timing components, bench tested, 12-month warranty
Suitability
Recommended if oil consumption exceeds 1L/600 miles or if engine has other major issues
1 - 2 daysAll prices are indicative UK market ranges based on current UK specialist supplier data.| Repair Tier | Dealer (Parts + Labour) | Specialist (Parts + Labour) | What It Involves | Suitability | Estimated Time |
|---|---|---|---|---|---|
 Intermediate - Valve Stem Seal Replacement (engine in situ) Minor | £3,500-£5,000 | £2,200-£3,500 | Replace all 32 valve stem seals using specialist tooling; engine remains in vehicle | Viable if smoke occurs but no other damage; requires specialist tooling | 1 - 2 days |
 Full Replacement - Rebuilt/Reconditioned Engine (with updated seals) Best Value | £8,000-£12,000 | £5,500-£8,500 | Supply & fit rebuilt N63 with upgraded valve seals and timing components, bench tested, 12-month warranty | Recommended if oil consumption exceeds 1L/600 miles or if engine has other major issues | 1 - 2 days |
Vehicle Value Check
Vehicle Value Check
A typical BMW X6 50i (E71 or F16) in fair condition is worth £6,000-£22,000 depending on age, mileage and specification. On an E71 X6 50i worth under £10,000, a £2,200-£3,500 specialist valve seal replacement offers excellent value compared to a £5,500+ full engine replacement. On an F16 X6 50i worth £15,000+, a rebuilt engine with warranty may be justifiable if the car is otherwise in excellent condition.
Our Recommendation
Our Recommendation
Valve stem seal failure is the most common issue on the N63 engine. If you notice blue smoke on startup or after deceleration, have the seals inspected immediately. Specialist valve seal replacement using upgraded N63TU seals costs around half the dealer price and can extend engine life significantly. Once oil consumption exceeds 1 litre every 600 miles, catalytic converter damage becomes likely, pushing you toward full engine replacement.
Don't Let Engine Failure Write Off Your BMW X6 50i
A failed N63 V8 engine doesn't have to mean the end of the road for your X6 50i. Whether you're facing valve stem seal failure, timing chain issues, HPFP problems, or any other catastrophic issue, EnginesMarket connects you with trusted UK BMW X6 50i specialists who supply rebuilt N63 engines with upgraded components specifically designed to address the original failure point. Every engine comes with a minimum 12-month unlimited mileage warranty, nationwide delivery, and supply & fit options across the UK. Compare prices today - and get your V8-powered X6 50i back on the road without paying the main dealer premium.
Compare rebuilt N63B44 BMW X6 50i engine prices
12-Month Minimum
UK Specialists Vetted
Best Price GuidanceImportant Information
Important Information
All prices are indicative UK market ranges based on historical quote data and repair requests from our network of engine specialists. Dealer pricing is estimated based on published main dealer labour rates and genuine OEM parts pricing. Specialist pricing reflects actual quote data from EnginesMarket's UK network. Actual costs vary depending on damage severity, vehicle condition, variant, and workshop location within the UK. Use our free comparison tool to get tailored quotes for your specific BMW X6 50i. Every engine supplied through EnginesMarket carries a minimum 12-month unlimited mileage warranty - always confirm exact terms with your chosen supplier.
BMW X6 50i Engine ReplacementFrequently Asked Questions
Question 1How much does a BMW X6 50i engine replacement cost in the UK-
A full BMW X6 50i engine replacement typically costs £3,500-£7,500 supply-only for rebuilt N63 V8 units, or £5,500-£10,000 fitted by a specialist.
- N63B44A (E71, 408hp) rebuilt supply-only: £5,500-£7,500 depending on mileage and condition
- N63B44B (F16, 445hp) rebuilt supply-only: £6,500-£8,500
- Professional fitting adds £1,000-£2,000 due to V8 complexity
Question 2Is the BMW X6 50i N63 engine reliable-
The N63 V8 is powerful and rewarding but has a reputation for heat-related issues. The most common problems are valve stem seal failure (causing blue smoke on startup), timing chain tensioner wear, and high-pressure fuel pump failure. The later N63TU (found in F16 X6 50i from 2013) addressed some early issues but retained the hot-vee architecture. With proactive maintenance and specialist care, the N63 can be a durable engine - but ownership requires a maintenance budget.
-> Find a reconditioned BMW X6 50i N63B44 engineQuestion 3What are the signs of valve stem seal failure on a BMW X6 50i-
The most common signs are blue smoke from the exhaust, especially during cold starts or after a hot soak, increased oil consumption (often 1L per 600 miles or more), a burning oil smell, and fouled spark plugs. If you notice any of these symptoms on your X6 50i, have the valve stem seals inspected immediately - catching it early means a £2,200-£3,500 specialist repair instead of a £5,500+ full engine replacement.
-> Compare rebuilt N63B44 BMW X6 50i engine pricesQuestion 4Does the BMW X6 50i have timing chain problems-
Yes - the N63 engine is known for timing chain tensioner wear and chain stretch. BMW itself acknowledges that "the timing chains on the N63 have been found to stretch and wear out prematurely". Symptoms include a rattling or slapping noise from the engine, especially during cold start-up. If you hear this noise, have the tensioner inspected immediately - replacement is far cheaper than a full engine rebuild.
-> Get quotes for N63B44 timing chain repair for BMW X6 50iQuestion 5Is it worth replacing the engine on a high-mileage BMW X6 50i-
For an X6 50i (E71 or F16) worth £6,000-£22,000, a £3,500-£7,500 rebuilt N63 engine can make financial sense if the body, gearbox and interior are sound. However, the N63 is a complex V8 and replacement costs are significantly higher than for six-cylinder X6 variants. Always factor the 12-month warranty into your replacement decision - a rebuilt engine with warranty offers peace of mind that a high-mileage used unit cannot match. For an E71 X6 50i worth under £8,000, carefully evaluate whether a rebuilt engine is financially sensible.
-> Check BMW X6 50i engine replacement value for your specific model yearQuestion 6What is the difference between the BMW X6 50i E71 and F16 engines-
The E71 X6 50i (2008-2012) uses the N63B44A engine producing 408hp and a 6-speed automatic transmission. The F16 X6 50i (2013-2019) uses the updated N63B44B (N63TU) engine producing 445hp and an 8-speed automatic transmission. The N63TU features improved injectors, valve seals, and cooling system components, addressing some of the early N63's reliability concerns. When ordering a replacement engine, ensure you match the correct engine code to your X6 50i's generation.
-> Find a code-matched BMW X6 50i replacement engine - enter your reg aboveWhy Choose UsCompare BMW X6 50iEngine PricesToday
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Comparing quotes for your BMW X6 50i engine replacement is completely free and carries no obligation. Enter your registration above, tell us your N63B44A or N63B44B engine code, and we'll connect you with trusted UK specialists who can supply or supply & fit the right V8 engine for your X6 50i - whether you have an E71 or F16 generation. All backed by a minimum 12-month unlimited mileage warranty.
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